Coating process



6am on PLASTIC UTOSS HBTBTBHCE UNITED STATES PATENT OFFICE LUDWIG ADRIAN SANDERS, OF AMSTERDAM, AND ARTHUR JULIUS SANDERS, OF SLOTEN, NETHERLANDS.

coa'rme rnocnss.

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To all whom it may concern Be it known that we, Doctor LUDWIG ADRIAN SANDERS and ARTHUR JULIUs SAN- DEBS, subjects of the Queen of the Netherlands, residing at Amsterdam and Sloten, respectively, Netherlands, have invented certain new and useful Improvements in Coating Processes, of which the following is a s cification.

he present invention comprehends an improved process of coating bodies or 0b- {pets consisting of cement, cement mortar,

'I'ne trass mortar, or concrete, whereby the surfaces of such bodies are colored with a variety of different tints, and at the same time, hardened to a very considerable extent.

The process consists primarily in the application, to the surfaces of the objects to treated of a metallic c gatipg, which con- 2 sists o a solution of a metal salt or salts other than fluorin and its derivatives, with the result that the action of the salt or salts not only produces a brilliant coloring on the aforesaid surface, bum, so that it is rendered impen wa er and, in

some cases, to 0115 and benzene. The material undergoing treatment consists essentially of concrete, or cement, or trass, and may be either in the form of solid bodies, or

of relativel thin layers of plaster or mortar .to be applied to various objects or bodies,

the results being substantially similar, in the main, in both cases. i

. In carrying out the improved process, ac-

cording to one form thereof, the exterior surface of the concrete article or bed to be 0 l i ll treated has applied to it a 0 tallic salt or salts,-for instance,

'ckelor ead or an ceco e 40 Eae c romate mtrate or diib'fid etc. orrund 1ts"iler1vaf1v es, however, Having proven incapable of being used, since the desired results are not obtainable therewithwhich has the effect of forming upon the surface tli'us treated a coating of the desired color, such color varying, of course, according to the metal or combination of metals employed. In many cases, an inner or sub surface coating or layer of great hardness -and density is also formed, this second or inner coating or layer uniting with theouter coating to form a composite layer which is repellent to water and in some cases, to oil and benzene and, to some extent, to acids as 65 well, as previously stated. The brilliancy Specification of Letters Patent.

Application filed December 10, 1915. Serial No. 86,119.

aered condition, such as iron filin re, titanic iron and the like, M w1t the concrete or cement, or lime trasF, and the resultant mass then applied 1n a p aster-like Patented Jan. 4, 1921.

of the color may be increased by subsequently enameling, glazing, varnishing or polishlng the coatlng surface. Also, in cases where a particularly smooth and hard surface is required, the surface to be treated may be polished prior to the application of the initial coating, the polishing being effected in any known manner, for instance by rubbing the surface with a hard smooth object.

According to the other form which the process may take, one or more metals, or metal ores, or both, 1n finely d1v1 e or pow condition to the articles ,or bodies to be treated and thereafter coated with the meing both with the metal salt solution and with the constituen s o e concre e or cement in producing otherwise unobtainable shades of Bronze colors. The laster roduced nTthls way, adheres rea 1 rm y esura 1sa 1e,

am layer to the walls of a concrete tank, and

thereafter treated with a solution of sulfate of copper. A coating is thereby formed on the mortar which is impenetrable to water,

oil and benzene and the like.

,2. A mortar, such as described in the first example, is applied to a concrete or cement wall, floor or dome, and thereafter treated 00 with a solution of chlorid of zinc or nickel.

A very hard and finely colored coating is thereby produced.

3. A roof or other tile is constructed. of cement, cement and sand, or concrete and 1 coated -with a layer of the above-described mortar, after which it is allowed to harden to the proper extent and then treated with -any one of the metal salt solutions previously referred to.

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tallic salt solution, the metal particles react- 75 4. A pressed tile is formed of pure Portland cement, and, after it has sufiiciently hardened, is treated with a solution of sulfate or acetate of lead, the coating thereby gbtailped penetrating the tile to a certain A block or tile made of cement or concrete, or lime trass is treated with sulfate of iron, either with or without pressure, such treatment hardening the block or stone considerably. v

The process above outlined is herein claimed more or less broadly, and the use in such process of a sulfate solution of the character above indicated has also been claimed. Claims for the specific use of acetate, nitrate, chromate and chlorid solutions are not incorporated herein but are comrised in our companion applications, Serial os. 426,613, 426,614, 426,615, and 426,616, all filed November 26, 1920, and all constituting divisions of the present application.

We claim as our invention 1. The process of ornamenting surfaces composed of, calcareous cements of the nature of hydraulic cement and of alkaline reaction because of the presence of lime therein, which comprises glvmg such a surface a thin outer colored coating by treating the surface with an aqueous solution of a neutral salt of a heavy metal forming colored oxids containing an acid not decomposed by the lime of the surface, wherebya deposit of a colored metal oxid is formed in the surface .layer by the interaction between the lime and the acid contained in the salt.

2. The process of ornamenting surfaces composed of calcareous cements of the nature of hydraulic cement and of alkaline reaction because of the resence of lime therein, which comprises giving such a surface a thin outer colored coating by treating the surface with an a ueous solution of a sulfate of a heavy meta forming colored oxids, whereby a deposit of a colored metal oxid is formed in the surface layer by the interaction between the lime and said sulfate.

3. The herein-described process, consisting in mixing metallic material in a finelydivided state with cementitious material to form a mortar or plaster-like body, and treating the surface of such body, after it has sufiiciently hardened, with a metal salt solution, which will color and harden said surface.

In testimony whereof we have hereunto set our hands 1n presence of two subscribing witnesses.

LUDWIG ADRIAN SANDERS. ARTHUR JULIUS SANDERS.

Witnesses D. KLEYN, R. MONAGAN. 

